package com.rwx.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.rwx.reggie.common.BaseContext;
import com.rwx.reggie.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();
        //定义不需要被拦截的请求
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**"
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3.如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求：{}，不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4.判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，id为{}",request.getSession().getAttribute("employee"));
            long id = Thread.currentThread().getId();
            log.info("doFilter的线程id为：{}", id);
            //根据session来获取之前我们存的id值
            Long empId = (Long) request.getSession().getAttribute("employee");
            //使用BaseContext封装id
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }

        //5.如果未登录则返回未登录结果,通过输出流方式向客户端页面响应数据
        log.info("用户未登录");
        log.info("用户id{}",request.getSession().getAttribute("employee"));
        response.getWriter().write(JSON.toJSONString(Result.error("NOTLOGIN")));



    }

    private boolean check(String[] urls,String uri){
        for (String url : urls) {
            boolean match=PATH_MATCHER.match(url,uri);
            if(match){
                //匹配
                return true;
            }

        }
        return false;
    }
}
